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3 years ago

F(x) = 2-4x; f(-5) A. 25 B. -22 C. 21 D. 22 Pls help like now

Mathematics

1 answer:

s2008m [1.1K]3 years ago

4 0

We are told that f(x) = 2 - 4x and we want to find f(-5).

To do this, we put -5 in for x in all places on both sides of the equals sign. The left side tells us the input while the right side tells us the output.

f(x) = 2 - 4x

f(-5) = 2 - 4(-5) <--------- notice how x and - 5 match

f(-5) = 2 - (-20) by applying the multiplication of 4 and -5

f(-5) = 2 + 20 by applying the parentheses

f(-5) = 22

Thus, f(-5) is 22 and choice D is best.

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